Staff Software Engineer (Frontend / UI)

Function Health•Canada, KS

About The Position

Function Health is seeking a highly skilled and product-minded Staff Software Engineer to join their team. This role involves leading the development of member-facing experiences that help individuals understand and act on their health data. The engineer will be responsible for shaping the architecture, performance, and usability of web and mobile applications, with the ability to contribute across the full stack. The ideal candidate possesses deep frontend expertise, strong product instincts, and a passion for building elegant user experiences, with a focus on performance, usability, accessibility, and design quality. They should also be comfortable building APIs, backend services, and scalable systems. As a key member of the engineering team, this role will influence how millions of users interact with their health information and drive technical decisions for Function's products.

Requirements

10+ years of software engineering experience, including significant experience building customer-facing products.
Proven success leading complex technical initiatives in high-growth or startup environments.
Experience balancing hands-on development with technical leadership and mentorship.
Deep expertise in JavaScript/TypeScript and modern frontend development.
Extensive experience with React and modern frontend architectures.
Strong understanding of: Design systems, Component libraries, State management, Accessibility (WCAG), Performance optimization, Frontend testing frameworks, Modern build and deployment tooling.
Experience building highly interactive, data-rich user interfaces.
Understanding of mobile architecture, performance optimization, and platform-specific considerations.
Experience designing and building APIs and backend services.
Strong proficiency with Python or similar backend technologies.
Ability to comfortably work across the entire application stack.
Experience integrating third-party services and external data platforms.
Strong product instincts and a passion for creating exceptional user experiences.
Ability to balance technical excellence with business impact.
Experience collaborating closely with Product and Design teams.
Strong understanding of: Agile development methodologies, Test-driven development, Continuous integration and deployment, Software architecture principles, Scalable system design.
Commitment to writing maintainable, high-quality code.
Ability to make progress in ambiguous environments.
Strong ownership mentality and willingness to tackle difficult problems.
Comfortable making decisions with incomplete information.
Adaptable and resourceful in fast-moving environments.
Excited to build processes, systems, and products from the ground up.
Thrives in rapidly evolving business and technical landscapes.
Exceptional communication skills.
Ability to explain complex technical concepts to non-technical stakeholders.
Strong collaborator across Engineering, Product, Design, and Operations teams.
Passion for learning new technologies and approaches.
Willingness to challenge assumptions and improve existing systems.
Growth mindset focused on continuous improvement.

Nice To Haves

Advanced expertise with React, React Native, and TypeScript.
Experience building large-scale consumer applications.
Experience developing data visualization and analytics experiences.
Familiarity with GCP, Postgres, and modern web architecture patterns.
Experience integrating AI or machine learning capabilities into user-facing products.
Startup experience as an early engineering hire, founder, or technical leader.

Responsibilities

Lead the architecture, design, and development of modern web and mobile applications.
Build intuitive, performant, and highly polished user experiences using React and React Native.
Establish frontend best practices around component architecture, state management, testing, accessibility, and performance.
Drive the evolution of our design system and shared UI component libraries.
Maintain a high bar for product quality, usability, and engineering excellence.
Own complex features end-to-end, from user interface development through backend services and APIs.
Collaborate closely with product, design, and data teams to transform ideas into exceptional customer experiences.
Design and implement scalable APIs and services that power our member-facing applications.
Contribute to technical decisions across frontend, backend, infrastructure, and data systems.
Champion frontend performance, responsiveness, accessibility, and reliability.
Optimize application performance across web and mobile platforms.
Leverage analytics and user feedback to continuously improve product experiences.
Ensure members can easily understand and interact with complex health information.
Provide architectural guidance and technical mentorship across the engineering organization.
Lead high-impact initiatives from concept through launch.
Drive engineering standards, code quality, and best practices.
Help scale engineering processes and systems to support rapid company growth.
Partner with Product, Design, Clinical, and Data teams to deliver impactful features.
Evaluate emerging technologies and development approaches to improve product quality and team velocity.
Foster a culture of continuous improvement, experimentation, and learning.